package com.tn.websocket;


import com.tn.utils.JsonUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections.CollectionUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @Author: Suzuki
 * @CreateTime: 2022-11-03  11:44
 * @Description: TODO
 * @Version: 1.0
 **/
@Component
@Slf4j
@ServerEndpoint("/websocket/{userId}")
public class WebSocket {
    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
    /**
     * 用户ID
     */
    private String userId;

    @Autowired
    private ThreadPoolTaskExecutor executor;


    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    //虽然@Component默认是单例模式的，但springboot还是会为每个websocket连接初始化一个bean，所以可以用一个静态set保存起来。
    //  注：底下WebSocket是当前类名
    private static CopyOnWriteArraySet<WebSocket> webSockets =new CopyOnWriteArraySet<>();
    // 用来存在线连接用户信息
    private static ConcurrentHashMap<String, List<Session>> sessionPool = new ConcurrentHashMap<String,List<Session>>();

    /**
     * 链接成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam(value="userId")String userId) {
        try {

            List<Session> sessions1=new ArrayList<>();
            this.session = session;
            this.userId = userId;
            webSockets.add(this);
            List<Session> sessions = sessionPool.get(userId);
            if (CollectionUtils.isEmpty(sessions)){
                sessions1.add(session);
                sessionPool.put(userId, sessions1);
                log.info("【websocket消息】有新的连接1，连接地址是:"+sessionPool);
            }else {
                sessions.add(session);
                sessionPool.put(userId, sessions);
                log.info("【websocket消息】有新的连接3，连接地址是:"+sessionPool);
            }
        } catch (Exception e) {
        }
    }

    /**
     * 链接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        try {
            webSockets.remove(this);
            List<Session> sessions = sessionPool.get(userId);
            sessions.remove(this.session);
            sessionPool.put(userId, sessions);
            log.info("【websocket消息】连接断开，总数为:"+webSockets.size());
        } catch (Exception e) {
        }
    }
    /**
     * 收到客户端消息后调用的方法
     *
     * @param message
     * @param session
     */
    @OnMessage
    public void onMessage(String message) {
        log.info("【websocket消息】收到客户端消息:"+message);
    }

    /** 发送错误时的处理
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {

        log.error("用户错误,原因:"+error.getMessage());
    }


    // 此为广播消息
    public void sendAllMessage(String message) {
        //log.info("【websocket消息】广播消息:"+message);
        for(WebSocket webSocket : webSockets) {
            try {
                if(webSocket.session.isOpen()) {
                    webSocket.session.getAsyncRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息
    public void sendOneMessage(String userId, String message) {
        List<Session> session = sessionPool.get(userId);
        executor.execute(()->{
            if (!CollectionUtils.isEmpty(session)){
                for (Session newSession : session) {
                    if (newSession != null&&newSession.isOpen()) {
                        try {
                            synchronized (newSession){
                                //newSession.getAsyncRemote().sendText(message);
                                newSession.getBasicRemote().sendText(message);
                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        });
    }

    // 此为单点消息(多人)
    public void sendMoreMessage(String[] userIds, String message) {
        for(String userId:userIds) {
            List<Session> session = sessionPool.get(userId);
            for (Session newSession : session) {
                if (newSession != null&&newSession.isOpen()) {
                    try {
                        log.info("【websocket消息】 单点消息:"+message);
                        newSession.getAsyncRemote().sendText(message);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }

    }

}
